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A student aide who had sex with five private schoolboys at an elite boys college in Australia had engaged in intercourse with the 15 to 17-year-olds with "enthusiastic participation" and a degree of "excitement", a court has heard.

The now 25-year-old woman, who has already spent 14 and a half months in prison, broke down in the dock as NSW District Court Judge Christopher Armitage made the remarks at her sentencing hearing.

The young woman's mother earlier told the court she blamed the exclusive boys college, The Armidale School for her daughter's actions.

The mother broke down in the NSW District Court in Sydney at which parents of the boys her daughter had sex with were present.

Asked by Crown Prosecutor Max Pincott about regret over her daughter's offences, the mother said "my greatest and deepest regret is the trust we placed in The Armidale School and its failure as her employer to supply duty of care and support to a junior unqualified member of staff."

The mother apologised for "the grief" of the families of the schoolboys her daughter had slept with in her staff accommodation room at the TAS boarding house in Armidale in northern NSW.

But asked if she understood the extent of that grief, the mother said, "I haven't spoken with them".

Under questioning from Judge Armitage, she agreed that her daughter "bears the major share of the responsibility" for the sexual acts which took place in late 2014 and early 2015 with boys aged between 15 and 17 years old.

The offender pleaded guilty in April to six counts of sexual intercourse with a person under her care, and three counts of aggravated sexual intercourse.

The woman's mother told the court her daughter, who was the subject of text message between the boys, including "you rooting that fat sl*t tonight" had low self esteem following a massive weight gain as a teenager.

Judge Armitage heard that the woman had texted a boy, "I can't wait to cuddle you tonight".

She exchanged a Facebook message with another pupil who talked about taking part in "somersaults", which meant sex.

The offender's defence barrister, Greg Heathcote, has argued she was forced into having sex with the boys by bullying, extortion and by blackmail via text messages.

The woman was working as a duty staff member, class coach and had responsibility 24/7 over the boys, Mr Heathcote told the court.

The identity of the school where the sexual intercourse between the schoolboys and the woman took place was only revealed after Judge Armitage lifted a non-publication order "in the interests of open justice".

The name of the woman offender and the boys however remain suppressed.

The woman's mother admitted her daughter had committed "errors of judgment", but said her daughter had suffered "crippling anxiety" and had undergone a pregnancy termination prior to having engaged in sex with the schoolboys.

She said her daughter's weight gain had been "immensely detrimental to her self esteem".

In one text message exchange, in February 2015, one of the adolescent boys wrote, "I promise I won't say anything, all the boys think you are as nice as f**k."